As per a request on the Obsidian Discord (shoutout to @scmwiz, @spacejunky, @kard32 and others) this allows note embeds to look as if they were part of the note in preview mode.
I’m not a huge fan of this approach, myself. I prefer to see the embedded note look a little different. But that’s just my personal taste.
I am not sure what you mean by that, but if it is that you don’t see the 1st letters of the embed anymore, then you should vary the margin-left number a bit.